The original StarDict project has recently been removed from SourceForge due to copyright infringement reports. Most of the files were lost with the demise of the project. The project has re-emerged here since then, though the legal issues may never have been resolved.

StarDict hasn’t seen any active development for many years, while the world around hasn’t stood still. The following is the list of alternatives appeared during that time. You are advised to take a look and try them:

GoldenDict – designed as a StarDict successor, it supports its format, lots of other formats (Lingvo, Babylon etc), features tabbed browsing, morphology, live pronunciations, Wikipedia and so on. The program is constantly being improved and worked on.
Babiloo – a free open source software developed to read offline dictionaries. Runs on most platforms. Supports StarDict and SDictionary formats.
LightLang – another system of electronic dictionaries (Linux only).

Some other free, but closed-source programs:

Lingoes – fast and lean, but Windows only, and supports only its own format.
Dicto – supports XDXF dictionaries. Windows only. Appears to be Russian-oriented.